Trans. Acad. Sci. of St. Louis. 
Mm 
Z 
56) / 
yee 
196 # Y 
192 ee 1A # 
x z aeAZe 
188 |__] ot seb ed BaeZeZTe 
4 et ee gt oa’ 
ad Ga a ete S228 Pah 
TTP aA Zee: ae 
180 2 LZ LE AAS at 
AAOZA Za 
"AVE A 
V/A 
172 Cal 
Aine) 
168 F}— aan : 
10 20 30 40 50 60 70 80 90 
Percentile Grades. 
VOL. VI. No. 12. PLATE XV (from Table No. 24; pages 311, 319). 
Boys’ Length of Head. 
